Question

Easily liquefiable gases show larger deviations from gas laws. Comment on this statement on the basis of kinetic molecular theory.

Answer 1

• In an ideal gas, the force of attraction between the molecule is zero and the volume of the molecule is zero.
• But for real gases, molecules interact with each other and they have non-zero volume.
• Liquification takes place only when the molecules come in contact with each other.
• That is at low temperature and high pressure a gas liquifies.
• At low temperatures, the kinetic energy of the molecule decreases.
• At high pressure, the intermolecular distance decreases, and the force of attraction between the molecules increases.
• So attraction between the molecule reduces, and the collision between the molecule and collision with the walls of the container also decreases.
• Hence at low temperature and high pressure, a point is reached where the molecule can no longer overcome the intermolecular attractive force, and then gases liquify.